Golf ball

a technology of golf balls and balls, applied in the field of golf balls, can solve problems such as energy loss, and achieve the effects of sufficient spin, excellent flight performance, and excellent flight performan

Active Publication Date: 2015-09-29
SUMITOMO RUBBER IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0019]In the golf ball according to the present invention, the ratio (Co / Ce) is great, and thus spin is suppressed upon a shot with a middle iron. In the core in which the ratio (Co / Ce) is great, an energy loss occurs. The core of the golf ball according to the present invention has a large diameter. A large diameter of the core compensates for the energy loss. The golf ball has excellent flight performance upon a shot with a middle iron. Upon a shot with a middle iron under the condition where a headwind blows, the golf ball is unlikely to rise during flight. The golf ball has excellent flight performance under the condition where a headwind blows. In the golf ball, the JIS-C hardness Hc of the cover is low, and thus sufficient spin occurs upon a shot with a short iron even though the ratio (Co / Ce) is great. The golf ball has excellent controllability upon a shot with a short iron.

Problems solved by technology

In the core in which the ratio (Co / Ce) is great, an energy loss occurs.

Method used

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Examples

Experimental program
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Effect test

example 1

[0126]A rubber composition (3) was obtained by kneading 100 parts by weight of a high-cis polybutadiene (trade name “BR-730”, manufactured by JSR Corporation), 18 parts by weight of zinc diacrylate, 5 parts by weight of zinc oxide, an appropriate amount of barium sulfate, 0.5 parts by weight of diphenyl disulfide, and 0.7 parts by weight of dicumyl peroxide. The rubber composition (3) was placed into a mold including upper and lower mold halves each having a hemispherical cavity, and heated at 170° C. for 15 minutes to obtain a center with a diameter of 18 mm.

[0127]A rubber composition (8) was obtained by kneading 100 parts by weight of a high-cis polybutadiene (the aforementioned “BR-730”), 35 parts by weight of zinc diacrylate, 5 parts by weight of zinc oxide, an appropriate amount of barium sulfate, 0.3 parts by weight of bis(pentabromophenyl)disulfide, and 0.9 parts by weight of dicumyl peroxide. Half shells were formed from the rubber composition (8). The center was covered wit...

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PUM

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Abstract

A golf ball 2 includes a core 4, a mid layer 6, and a cover 8. The core 4 includes a center 10 and an envelope layer 12. The ratio of the volume Ve of the core 4 to the volume of a phantom sphere of the golf ball 2 is equal to greater than 76%. The ratio (Co / Ce) of an amount of compressive deformation Co of the center 10 to an amount of compressive deformation Ce of the core 4 is greater than 2.0 but less than 3.0. The ratio (Vo / Ve) of the volume Vo of the center 10 to the volume Ve of the core 4 is equal to or greater than 0.01 but equal to or less than 0.13.

Description

[0001]This application claims priority on Patent Application No. 2010-293535 filed in JAPAN on Dec. 28, 2010. The entire contents of this Japanese Patent Application are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to golf balls. Specifically, the present invention relates to multi-piece golf balls that include a center, an envelope layer, a mid layer, and a cover.[0004]2. Description of the Related Art[0005]Golf players' foremost requirement for golf balls is flight performance. Golf players place importance on flight performance upon shots with a driver and a long iron. Flight performance correlates with the resilience performance of a golf ball. When a golf ball with excellent resilience performance is hit, the golf ball flies at a high speed, thereby achieving a large flight distance.[0006]An appropriate trajectory height is required in order to achieve a large flight distance. A trajectory height ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): A63B37/06A63B37/00A63B37/02A63B37/12
CPCA63B37/0024A63B37/0063A63B37/0064A63B37/0076A63B37/0087A63B37/02A63B37/06A63B37/12A63B37/0003A63B37/0031A63B37/0043A63B37/0044
Inventor SAJIMA, TAKAHIROMATSUYAMA, YOSHIKO
Owner SUMITOMO RUBBER IND LTD
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